The IDNR Division of Forestry keeps track of the largest trees in each species (nominated by local individuals) and publishes their findings once a year. Gibson County has the honor of possessing one of biggest trees in Indiana this year: the largest Overcup Oak. For those unsure what an Overcup Oak is, you were not alone. Here is a link for more information: http://www.dendro.cnre.vt.edu/dendrology/syllabus/factsheet.cfm?ID=71.
At a height of 102', it should not be too difficult to find Betty Smith's tree in Princeton.
For more of the biggest trees in this or other states, check out Indiana Big Tree 2010 here: http://www.treesinc.org/big_tree.html.